<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
  <style>
    div{
      width: 500px;
      height: 500px;
      background: lightblue;
      border-radius: 50px;
    }
  </style>
</head>
<body>
<div></div>
</body>
</html>